I've had "closure" on very good terms with three therapists. It really wasn't a big deal. I wouldn't say anything in particular happened except we said our goodbyes and went our separate ways. We knew the time was coming, so it just kind of happened naturally. With my most recent I wouldn't even say we said goodbye. I just chose to stop going to sessions because I really didn't need to go any longer. It wasn't a surprising choice to my therapists; again, we saw it coming so it was just a natural process of moving on.